Once you start using a c-arm in your facility, you need to look at your new modality as a functioning radiology department. DEP and State regulations and guidelines have been established for you to adhere to. In some states, not adhering to these regulations can result in a cease and desist order which may also include fines.
Here are some links to help you navigate through the rules and regulations that may be in your state.
I recommend creating policies that other state utilize when developing your own facilities policies. Patient and staff safety depend on a full understanding of the harmful effects of ionizing radiation. Simple changes and advancements towards a better facility policy only foster better radiation safety practices for all.